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You cannot rewrite or otherwise change transactions with a 51% attack, nor can you capture any bitcoin. You can, however, deny certain (or all) transactions fr
by deweller 9y ago
You cannot rewrite or otherwise change transactions with a 51% attack, nor can you capture any bitcoin.
You can, however, deny certain (or all) transactions from being mined into a block. And you can exclude past transactions if you can overtake the current longest chain.
But rewriting history to exclude past transactions would require more than 51% of the hashing power. The further back you go, the more power it will require to overtake the longest chain.
- tylersmith 9y agoWith more than 50% you can reject all other blocks and keep the chain to yourself.
- sanswork 9y agoYes you can. Rewriting a transaction is exactly what a double spend is.
- deweller 9y agoYes - for your own coins. You can re-spend the coins that you own and send them to another location and invalidate one of your own spends. You cannot rewrite or modify any other transactions that you do not hold the private keys for. You can only withhold them from a block.